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Avalanche Forecast

Archived

Nov 23rd, 2025–Nov 24th, 2025

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Banff Yoho Kootenay, Little Yoho, Banff, East Side 93N, Kootenay, Lake Louise, LLSA, Sunshine, West Side 93N, Field.

Up to 50 cm of storm snow has fallen so far, and more is expected to come. The avalanche danger will remain elevated on Monday.

Continued reports of avalanche activity, both natural and skier-involved, have come in over the weekend.

Time to dial things back until the new snow has a chance to settle and bond.

Confidence

High

Avalanche Summary

Saturday, two reports of skier-involved avalanches were reported in the forecast region. Both were steep couloirs, and occurred as the storm was ramping up. On Sunday, we received reports of an active natural avalanche cycle in the alpine (limited observations).

Snowpack Summary

Up to 50 cm of new snow over the weekend and moderate to strong SW winds are creating fresh wind slabs in alpine and exposed treeline terrain. Below this, most observations suggest a generally well-settled Rockies snowpack with no significant weak layers. Last week’s warm, wet weather produced a Nov 13 rain crust up to 2300 m. Overall, early-season travel conditions are good, with treeline snow depths of 40–80 cm.

Weather Summary

West of the divide, the storm will taper off Sunday night with a clearing trend starting Monday. Colder air follows, with a forecast low of –20 °C on Tuesday. East of the divide, an upslope system may bring up to 10 cm of snow Monday. Variable winds will continue to transport snow at ridge crest for the start of the week.

Click here for Environment Canada links to weather tables for the region.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
  • Be careful with sluffing in steep terrain, especially above cliffs and terrain traps.

Problems

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.